Zero vs Window: which intermittent fasting apps should you pick?
Our independent head-to-head from the 2026 edition of Best Intermittent Fasting Apps.
Zero
The reference fasting app – clean, research-backed, no nonsense.
8.7/ 10
Window
Minimalist fasting timer.
7/ 10
Head-to-head
| Zero | Window | |
|---|---|---|
| Our score | 8.7/10 | 7/10 |
| Pricing | Free; Plus $69.99/yr | Free; Premium $39.99/yr |
| Best for | Most people starting IF | Minimalists |
| Platforms | iOS, Android | iOS |
Pros & cons
Zero pros
- Clean, focused UI
- Research-anchored content from credible advisors
- Good HealthKit integration
Zero cons
- Plus tier is needed for personalized plans
- Some content gates feel arbitrary
Window pros
- Beautiful, minimal UI
- No fluff
Window cons
- iOS only
- Limited coaching
Our verdict
Winner: Zero. The cleanest, most evidence-respecting fasting app. Free tier alone covers 90% of users.
In short
- Zero – The cleanest, most evidence-respecting fasting app. Free tier alone covers 90% of users.
- Window – Buy it if you want a timer and nothing else.
See the full best intermittent fasting apps ranking for every app in this category, or browse all head-to-heads.